The Mac has the same layout, but the keys have different labels. So when you hear you should press the "Home" key to take a step forward, you press the equivalent key, which is the arrow pointing to the upper left.

Note #1: the latest aluminium keyboards shipped with the alu iMacs have the same labels as standard PC keyboards.

Note #2: some laptops (ibook G3 for example) don't have the "insert/delete" keys, and for the other keys you have to hold the Fn key